function [IA_Network] = IA_Network_Add_Interval(IA_Network, IA_Interval)
%IA_Network_Add_Interval Summary of this function goes here
%   Detailed explanation goes here

IA_Network.nodes = [IA_Network.nodes IA_Interval];
s = size(IA_Network.relations, 1);

if (s > 0)
  for i = 1 : s
    IA_Network.relations(i, s + 1) = IA_Relation_Dummy();
  end

  for i = 1 : s
    IA_Network.relations(s + 1, i) = IA_Relation_Dummy();
  end
  
  IA_Network.relations(s + 1, s + 1) = IA_Relation_Equals();
else
  IA_Network.relations = IA_Relation_Equals();
end
end